Table 2.
Distribution of never, former and current smokers at successive resurveys, stratified by smoking status reported at baseline (n = 51 365 participants)
| Duration of follow-up and smoking status at resurvey, n (%)a | Smoking status at baseline | ||
|---|---|---|---|
| Never smoking | Former smoking | Current smoking | |
| <5 years | |||
| Never smoking | 8113 (98.4) | 371 (8.7) | 18 (2.6) |
| Former smoking | 126 (1.5) | 3807 (89.7) | 241 (34.1) |
| Current smoking | 7 (0.1) | 68 (1.6) | 447 (63.3) |
| 5 to <10 years | |||
| Never smoking | 15 793 (98.3) | 723 (9.0) | 40 (2.3) |
| Former smoking | 261 (1.6) | 7133 (89.2) | 819 (48.0) |
| Current smoking | 14 (0.1) | 142 (1.8) | 849 (49.7) |
| ≥10 years | |||
| Never smoking | 7507 (98.2) | 377 (9.5) | 20 (2.5) |
| Former smoking | 129 (1.7) | 3534 (89.2) | 474 (60.1) |
| Current smoking | 7 (0.1) | 50 (1.3) | 295 (37.4) |
aRepeat ascertainment of smoking status was undertaken in sub-samples of the original participant cohort that underwent resurveys between 2012 and 2021. Column percentages shown.